Square-shell lithium ion battery module integrated structure

Abstract

The utility model relates to the technical field of lithium ion battery modules, and particularly provides a square-shell lithium ion battery module integrated structure which comprises a cover plate, a first end plate, a second end plate, a square-shell lithium ion battery pack, a bottom plate, two side plates and a BMS (Battery Management System) assembly, the BMS assembly is integrated in the first end plate; the bottom plate comprises a bottom plate body, bow-shaped heat dissipation fins and a heat conduction layer, the bottom plate body comprises a liquid cooling area, a first extension area and a second extension area, the first extension area and the second extension area are arc-shaped and are matched with the cross section structures of the first end plate and the second end plate, and the bow-shaped heat dissipation fins are vertically arranged on the liquid cooling area; the heat conduction layer is located between the liquid cooling area and the bow-shaped heat dissipation fins, and the surfaces of the bow-shaped heat dissipation fins are provided with insulating films. And the square-shell lithium ion battery is inserted into the bow-shaped radiating fins. According to the utility model, not only is the heat dissipation effect of the battery module improved, but also the integration and collection of the battery module poles are convenient, safe and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion battery modules, in particular to an integrated structure of a square-shell lithium-ion battery module. Background Art

[0002] A square-shell lithium-ion battery module is usually composed of several square-shell lithium-ion batteries connected in series and parallel, a BMS, a cooling system, and a casing. The BMS plays a vital role in this process. It can monitor the battery module status, such as key parameters such as the voltage, current, and temperature of the battery module, and monitor the battery status in real time to ensure that the battery operates within a safe range. It can also immediately cut off the connection between the battery module and the load when the battery experiences abnormal conditions such as overcharging, over-discharging, overcurrent, and overtemperature, to prevent damage to the battery module or danger. It also has the functions of battery energy management and battery balancing management. In traditional technology, the various modules that make up the BMS are assembled separately from the battery module and electrically connected through copper busbars. Therefore, separate bolts and structural adhesives are required for fixing. The assembly process involves many parts and the operation is cumbersome. The existing technology integrates the various modules of the BMS to obtain a BMS circuit board. After the modules are assembled, the BMS circuit board is assembled with the modules. For example, the BMS circuit board is first fixed to the end plate and then assembled with the module. This method can solve the problems in the traditional technology to a certain extent. However, the BMS circuit board and the end plate still need to be fixed with separate screws and structural adhesives, and some also require the assistance of a specific mounting bracket, which makes the overall weight of the module heavier.

[0003] For this purpose, this application is filed. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the utility model provides a square shell lithium ion battery module integrated structure.

[0005] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0006] A square shell lithium ion battery module integrated structure, comprising: a cover plate, a first end plate, a second end plate, a square shell lithium ion battery pack, a bottom plate, a first side plate, a second side plate and a BMS assembly;

[0007] The BMS assembly is integrated into the first end plate;

[0008] The square shell lithium ion battery pack is composed of a plurality of square shell lithium ion batteries connected in series, and the positive electrode and the negative electrode of the square shell lithium ion battery pack are both led out from one end of the square shell lithium ion battery pack close to the first end plate;

[0009] The bottom plate comprises a bottom plate body, an arch-shaped heat dissipation fin and a heat conduction layer, the bottom plate body comprises a rectangular liquid cooling area and first and second extension areas oppositely arranged at two ends of the liquid cooling area, a liquid cooling pipeline is arranged in the liquid cooling area, liquid outlets and liquid inlets of the liquid cooling pipeline are led out from the second extension area and the first extension area respectively, the first and second extension areas are arc-shaped and match cross-sectional structures of the first and second end plates, the arch-shaped heat dissipation fin is vertically arranged on the liquid cooling area, the heat conduction layer is located between the liquid cooling area and the arch-shaped heat dissipation fin, and an insulating film is arranged on a surface of the arch-shaped heat dissipation fin.

[0010] A plurality of accommodation grooves are formed in the arch-shaped heat dissipation fin, the square lithium ion battery is inserted into the accommodation grooves, left and right ends and a top of the bottom plate are detachably connected with the first and second end plates and the cover plate, and the first and second end plates are detachably connected through the oppositely arranged first and second side plates.

[0011] Preferably, the BMS assembly comprises a BMS plate and a BMS plate mounting member, the BMS plate mounting member comprises a mounting plate body, an arch-shaped portion and a pair of insertion strips, the mounting plate body is partially protruded to form the arch-shaped portion, the arch-shaped portion constitutes a receiving cavity of the BMS plate, and the insertion strips are located on a bottom surface of the mounting plate body; a cavity is arranged in a middle portion of the first end plate, a pair of clamping grooves are arranged in the cavity, the clamping grooves match the insertion strips in structure, and an arch surface of the cavity matches the arch-shaped portion in structure.

[0012] Preferably, the BMS plate and the BMS plate mounting member are screwed, buckled or welded.

[0013] Preferably, a reinforcing rib plate extending in a "Z" shape is arranged in each of the first and second end plates.

[0014] Preferably, the square lithium ion battery pack is composed of 13 square lithium ion batteries connected in series, and positive and negative pole columns of the square lithium ion batteries are located at top ends of the square lithium ion batteries and are higher than a top end of the arch-shaped heat dissipation fin.

[0015] Preferably, the liquid cooling area is a thin-walled aluminum plate with a cavity, a thickness of the thin-walled aluminum plate is 2.50-5.50 mm, and the arch-shaped heat dissipation fin is a solid aluminum plate with an insulating film covering a surface of the solid aluminum plate, a thickness of the solid aluminum plate is 0.55-0.95 mm.

[0016] Preferably, the first extension area, the liquid cooling area and the second extension area are an integrated structure.

[0017] Preferably, four buckling blocks for buckling with the first and second end plates are further arranged on the bottom plate body.

[0018] Preferably, the heat conduction layer is a heat conduction structural adhesive or a heat conduction pad.

[0019] Preferably, the fixing belt is further arranged.

[0020] Compared with the prior art, the battery module of the utility model has the advantages of scientific structure design, compact layout, improved heat dissipation effect of the battery module, and convenient, safe and efficient battery module pole integration and collection. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 It is an explosion structure schematic view of the utility model;

[0023] Figure 2 It is Figure 1 It is a pole connection schematic view of each square shell lithium ion battery in the utility model;

[0024] Figure 3 It is Figure 1 It is a structure schematic view of the arch-shaped heat dissipation fin in the utility model;

[0025] Figure 4 It is Figure 1 It is a structure schematic view of the BMS board and the BMS board mounting member in the utility model.

[0026] In the drawing: 1, cover plate; 11, first connecting hole; 2, first end plate; 21, cavity; 22, clamping groove; 23, second connecting hole; 3, second end plate; 31, fifth connecting hole; 32, reinforcing rib; 4, square shell lithium ion battery pack; 5, bottom plate; 51, bottom plate body; 511, first extension area; 512, liquid cooling area; 513, second extension area; 514, buckling block; 515, liquid outlet; 516, liquid inlet; 52, arch-shaped heat dissipation fin; 53, heat conduction layer; 6, BMS board; 61, third connecting hole; 7, BMS board mounting member; 71, mounting plate body; 72, arched part; 73, insertion strip; 74, fourth connecting hole; 8, first side plate; 9, second side plate. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0028] The structures of the following embodiments not described in detail are prior art, and the orientation words such as "upper surface", "lower surface", "bottom surface" and the like adopted for clearly describing the structures of components only represent the relative position relationship and are not used for limiting the protection scope of the utility model.

[0029] As Figures 1-4 It is collectively shown that an integrated structure of a square shell lithium ion battery module includes a cover plate 1, a first end plate 2, a second end plate 3, a square shell lithium ion battery pack 4, a bottom plate 5, a first side plate 8, a second side plate 9 and a BMS assembly.

[0030] The BMS assembly includes a master control module, a slave control module for monitoring the battery module and collecting voltage, current, temperature and other data, an equalization module for realizing energy equalization in the battery module, a fuse, a high-voltage control module, a battery state indication module, a communication module, a display module and the like, which are integrated and arranged in the first end plate 2.

[0031] The square shell lithium ion battery pack 4 is composed of a plurality of square shell lithium ion batteries connected in series, and the positive and negative electrodes of the square shell lithium ion battery pack 4 are led out from one end of the square shell lithium ion battery pack 4 close to the first end plate 2.

[0032] The bottom plate 5 includes a bottom plate body 51, an arch-shaped heat dissipation fin 52 and a heat conduction layer 53. The bottom plate body 51 includes a rectangular liquid cooling area 512 and first and second extension areas 511 and 513 oppositely arranged at both ends of the liquid cooling area 512. A liquid cooling pipeline is arranged in the liquid cooling area 512. The liquid outlet 515 and the liquid inlet 516 of the liquid cooling pipeline are led out from the second extension area 513 and the first extension area 511, respectively. The first and second extension areas 511 and 513 are arc-shaped and match the cross-sectional structure of the first and second end plates 2 and 3, i.e., the first and second end plates 2 and 3 are arched end plates. The arch-shaped heat dissipation fin 52 is vertically arranged on the liquid cooling area 512. The heat conduction layer 53 is located between the liquid cooling area 512 and the arch-shaped heat dissipation fin 52. An insulating film is arranged on the surface of the arch-shaped heat dissipation fin 52.

[0033] A plurality of accommodation grooves are formed in the arch-shaped heat dissipation fin 52. The square shell lithium ion batteries are inserted into the accommodation grooves. The left and right ends and the top of the bottom plate 5 are detachably connected with the first and second end plates 2 and 3 and the cover plate 1, respectively. The first and second end plates 2 and 3 are detachably connected through the oppositely arranged first and second side plates 8 and 9.

[0034] In assembling, each square shell lithium ion battery is inserted into the accommodating groove of the arch-shaped heat dissipation fin 52 and the poles are connected in series, then the first end plate 2 is placed at the left end of the bottom plate 5, that is, the bottom of the first end plate 2 is aligned with the first extension area 511, the second end plate 3 is placed at the right end of the bottom plate 5, that is, the bottom of the second end plate 3 is aligned with the second extension area 513, finally the cover plate 1 is covered, and then the left end of the cover plate 1 is detachably connected with the first end plate 2 and the first extension area 511, the right end of the cover plate 1 is detachably connected with the second end plate 3 and the second extension area 513, and the first end plate 2 and the second end plate 3 are detachably connected through the first side plate 8 and the second side plate 9.

[0035] Compared with the prior art, the main improvement of the utility model lies in that:

[0036] (1) The BMS assembly is arranged in the first end plate 2 after integration, which not only provides a separate installation and operation space for the BMS assembly to play a good protection role, but also the adjacent arch-shaped heat dissipation fin 52 can effectively play a heat dissipation role to timely disperse the heat generated by the operation of the BMS assembly, thereby ensuring the normal use of the BMS assembly, so that the BMS assembly does not need to be additionally provided with a heat dissipation plate, and the utility model not only strengthens the protection effect of the BMS assembly, but also helps the lightweight of the battery module;

[0037] (2) The heat generated by the bottom small surface of the square shell lithium ion battery pack 4 is partly transmitted to the liquid cooling area 512 by the heat conduction layer 53 for cooling, and the heat generated by the side surface of the square shell lithium ion battery pack 4 is dissipated through the arch-shaped heat dissipation fin 52 wrapped thereon, and the multiple effects help to significantly improve the heat dissipation performance of the square shell lithium ion battery pack 4; the arch-shaped heat dissipation fin 52 also plays the role of a partition plate between each square shell lithium ion battery, the bottom plate 5 integrates the supporting function, the heat dissipation function and the partition plate function, which simplifies the structural design of the battery module, reduces the cost and the occupied space, and further improves the lightweight degree and the volume energy density of the battery module;

[0038] (3) The positive electrode and the negative electrode of the square shell lithium ion battery pack 4 are led out from the same end, the connection is simple, the collection line of the battery module is short, the leading-out is convenient for connection with the BMS assembly, the wire harness placement does not need to be considered, and the safety is high;

[0039] (4) The arched end plate is more material-saving than the current flat plate type structure and helps the lightweight of the end plate, the strength and the deformation resistance are also better, the strength requirement of the square shell lithium ion battery module is met, and the whole battery module is not easy to deform due to the expansion of a single battery.

[0040] As a preferred technical scheme, in a further embodiment of the utility model, the BMS assembly comprises a BMS plate 6 and a BMS plate mounting piece 7, the BMS plate mounting piece 7 comprises an installation plate body 71, an arch part 72 and a pair of insertion strips 73, the installation plate body 71 is partially protruded to form the arch part 72, the arch part 72 constitutes the containing cavity of the BMS plate 6, and the insertion strip 73 is located at the bottom surface of the installation plate body 71.

[0041] As a preferred technical scheme, in a further embodiment of the utility model, the BMS plate 6 and the BMS plate mounting piece 7 are screwed, buckled or welded.

[0042] In the embodiment, each module of the BMS assembly is first integrated on the BMS plate 6, and then the BMS plate 6 is fixedly connected with the BMS plate mounting piece 7, for example, the BMS plate 6 is provided with third connecting holes 61 at four corners, the BMS plate mounting piece 7 is provided with fourth connecting holes 74 at four corners, corresponding third connecting holes 61 and fourth connecting holes 74 are fixed by screws, and after connection, each module is located in the arch part 72, and the arch part 72 constitutes the containing cavity of the modules and can protect the modules well. During installation, the BMS plate mounting piece 7 can be directly inserted into the pair of clamping grooves 22 in the first end plate 2 through the pair of insertion strips 73 arranged at the bottom of the BMS plate mounting piece 7, and after the first end plate 2 is connected with the cover plate 1, the BMS assembly can be finally fixed and clamped without using additional fixing pieces. The arch surface of the cavity 21 and the arch part 72 can double-protect the BMS plate 6.

[0043] As a preferred technical scheme, in a further embodiment of the utility model, the first end plate 2 and the second end plate 3 are both provided with a reinforcing rib plate extending in a "Z" shape.

[0044] In the embodiment, the reinforcing rib plate extending in a "Z" shape is arranged in the arched first end plate 2 and the second end plate 3, a plurality of stable triangular structures are formed in the reinforcing rib plate, the strength of each end plate and the ability to resist deformation are further improved, the strength requirement of the square shell lithium ion battery module is met, and the entire battery module is not easy to deform due to the expansion of a single battery. In addition, the end plate structure is more material-saving and helps the lightweight of the end plate compared with the current flat plate structure.

[0045] As a preferred technical scheme, in a further embodiment of the utility model, the square shell lithium ion battery pack 4 is composed of 13 square shell lithium ion batteries connected in series, and the positive and negative poles of the square shell lithium ion batteries are both located at the top end and higher than the top end of the arch-shaped heat dissipation fin 52.

[0046] In the embodiment, 13 square lithium ion battery positive and negative poles are vertically placed in a row with the positive and negative poles of adjacent two square lithium ion batteries being opposite, and the connection mode of the positive and negative poles of the 13 square lithium ion batteries is specifically as shown in the figure. Figure 2 Finally, the negative pole of the 13th square lithium ion battery is led out as the total negative pole of the square lithium ion battery pack 4, and the positive pole of the 11th square lithium ion battery is led out as the total positive pole of the square lithium ion battery pack 4, and the total negative pole and the total positive pole are located at the same end of the square lithium ion battery pack 4, and the end is placed close to the first end plate 2 during assembly to be connected with the BMS assembly.

[0047] As a preferred technical solution, in another embodiment of the utility model, the liquid cooling area 512 is a thin-walled aluminum plate with a cavity, the thickness of the thin-walled aluminum plate is 2.50-5.50mm, and the arch-shaped heat dissipation fin 52 is a solid aluminum plate with an insulating film on the surface, and the thickness of the solid aluminum plate is 0.55-0.95mm.

[0048] In the embodiment, the material and thickness of the liquid cooling area 512 and the arch-shaped heat dissipation fin 52 are selected based on the comprehensive consideration of cost, heat dissipation performance and strength, and are the optimal selection.

[0049] As a preferred technical solution, in another embodiment of the utility model, the first extension area 511, the liquid cooling area 512 and the second extension area 513 are integrated structures, that is, the first extension area 511 and the second extension area 513 also have liquid cooling functions.

[0050] As a preferred technical solution, in another embodiment of the utility model, the bottom plate body 51 is further provided with four buckling blocks 514 for buckling with the first end plate 2 and the second end plate 3.

[0051] In the embodiment, the structure of the buckling block 514 matches the structure of the second connecting hole 23 on the first end plate 2 and the fifth connecting hole 31 on the second end plate 3. During assembly, the first end plate 2 is buckled to the bottom plate 5 through the second connecting hole 23, the second end plate 3 is buckled to the bottom plate 5 through the fifth connecting hole 31, and then the cover plate 1 is arranged on the top end of the first end plate 2 and the second end plate 3. Then, the various parts are connected and fixed by bolts or other existing connecting members. The design of the buckling block 514 can pre-fix the bottom plate 5, the first end plate 2 and the second end plate 3, which can improve the fixing efficiency of the subsequent parts, improve the fixing effect, and facilitate the fixing operation.

[0052] As a preferred technical solution, in another embodiment of the utility model, the heat conduction layer 53 is a heat conduction structural adhesive or a heat conduction pad.

[0053] As a preferred technical solution, in another embodiment of the utility model, the utility model further comprises a fixing belt. The fixing belt is preferably made of an insulating material. After the plurality of square shell lithium ion batteries are inserted into the accommodating grooves of the arch-shaped heat dissipation fins 52, the fixing belt is used to bundle the plurality of square shell lithium ion batteries first, and then the series connection of the pole posts is performed. In this way, the pole post connection operation is facilitated, and the connection quality of the pole posts is guaranteed.

[0054] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model. Those skilled in the art can modify, replace, deform and combine the above-mentioned embodiments within the scope of the utility model. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without mutual contradiction.

Claims

1. A prismatic lithium-ion battery module integration structure, characterized by, The application relates to a lithium ion battery pack, which comprises a cover plate (1), a first end plate (2), a second end plate (3), a square lithium ion battery pack (4), a bottom plate (5), a first side plate (8), a second side plate (9) and a BMS assembly. The BMS assembly is integrated in the first end plate (2). The square lithium ion battery pack (4) is composed of a plurality of square lithium ion batteries connected in series, and the positive and negative poles of the square lithium ion battery pack (4) are led out from one end of the square lithium ion battery pack (4) close to the first end plate (2). The bottom plate (5) comprises a bottom plate body (51), an arch-shaped heat dissipation fin (52) and a heat conduction layer (53), the bottom plate body (51) comprises a rectangular liquid cooling area (512) and first and second extension areas (511 and 513) oppositely arranged at two ends of the liquid cooling area (512), a liquid cooling pipeline is arranged in the liquid cooling area (512), the liquid outlet (515) and the liquid inlet (516) of the liquid cooling pipeline are led out from the second extension area (513) and the first extension area (511) respectively, the first and second extension areas (511 and 513) are arc-shaped and matched with the cross-sectional structures of the first end plate (2) and the second end plate (3), the arch-shaped heat dissipation fin (52) is vertically arranged on the liquid cooling area (512), the heat conduction layer (53) is located between the liquid cooling area (512) and the arch-shaped heat dissipation fin (52), and an insulating film is arranged on the surface of the arch-shaped heat dissipation fin (52). A plurality of accommodating grooves are formed in the arch-shaped heat dissipation fin (52), the square lithium ion batteries are inserted into the accommodating grooves, the left and right ends and the top of the bottom plate (5) are detachably connected with the first end plate (2), the second end plate (3) and the cover plate (1) respectively, and the first end plate (2) and the second end plate (3) are detachably connected through the oppositely arranged first and second side plates (8 and 9). The BMS assembly comprises a BMS plate (6) and a BMS plate mounting piece (7), the BMS plate mounting piece (7) comprises a mounting plate body (71), an arch-shaped part (72) and a pair of inserting strips (73), the mounting plate body (71) is partially protruded to form the arch-shaped part (72), the arch-shaped part (72) forms a containing cavity of the BMS plate (6), and the inserting strips (73) are located on the bottom surface of the mounting plate body (71); a cavity (21) is arranged in the middle part of the first end plate (2), a pair of clamping grooves (22) are arranged in the cavity (21), the clamping grooves (22) are matched with the inserting strips (73), and the arch surface of the cavity (21) is matched with the arch-shaped part (72).

2. The prismatic lithium-ion battery module integration structure of claim 1, wherein, The BMS plate (6) and the BMS plate mounting piece (7) are screwed, buckled or welded.

3. The prismatic lithium-ion battery module integration structure of claim 2, wherein, The first end plate (2) and the second end plate (3) are both provided with a reinforcing rib plate extending in a "Z" shape.

4. The prismatic lithium-ion battery module integration structure of claim 1, wherein, The square lithium ion battery pack (4) is composed of 13 square lithium ion batteries connected in series, and the positive and negative pole columns of the square lithium ion batteries are located at the top end of the square lithium ion batteries and are higher than the top end of the arch-shaped heat dissipation fin (52).

5. The prismatic lithium-ion battery module integration structure of claim 1, wherein, The liquid cooling area (512) is a thin-walled aluminum plate with a cavity, the thickness of the thin-walled aluminum plate is 2.50-5.50 mm, and the arch-shaped heat dissipation fin (52) is a solid aluminum plate with an insulating film covered on the surface, the thickness of the solid aluminum plate is 0.55-0.95 mm.

6. The prismatic lithium-ion battery module integration structure of claim 1, wherein, ​ 7. The prismatic lithium-ion battery module integration structure of claim 6, wherein, The first extension area (511), the liquid cooling area (512) and the second extension area (513) are integrated structures.

8. The prismatic lithium-ion battery module integration structure of claim 1, wherein, The bottom plate body (51) is further provided with four buckling blocks (514) for buckling with the first end plate (2) and the second end plate (3).

9. The prismatic lithium-ion battery module integration structure of claim 1, wherein, The heat conduction layer (53) is a heat conduction structural adhesive or a heat conduction pad.

10. The prismatic lithium-ion battery module integration structure according to any one of claims 1-9, wherein, Further comprising a fixing belt.

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